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Description of problem:
net ads join doesn't use the existing krb5 ticket unless the undocumented -k option is provided. Lack of this documentation is causing great confusion for users (just see how many guide instruct to do "kinit username ; net ads join -U username%password").

# export KRB5CCNAME=/tmp/ticket
# kinit
Password for admin.COM: 
# net ads join
Enter root's password: 
Interrupted by signal.
# net ads join -U admin
Enter admin's password: 
Interrupted by signal.
# net ads join -k
Using short domain name -- DOMAIN
Joined 'SMBTEST1' to realm 'DOMAIN.EXAMPLE.COM
# 

Version-Release number of selected component (if applicable):
samba-common-3.5.6-86.el6_1.4.x86_64

See also https://bugzilla.redhat.com/show_bug.cgi?id=737808.

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
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    New Contents:
Cause: The net manpage did not contain documentation for using kerberos authentication.

Consequence: Users were not aware how to use kerberos authentication from the net binary.

Fix: Manpage update.

Result:

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2011-1519.html